Ok I searched alittle and couldn't find a clear cut answer so Ill just throw it out and hope I don't get flamed horribly.. Ok I have a 94 LS stock head stock block with gsr tranny

Pte sc34
Inline cast mani
Tial 38
walbro 255
RC 440s or 400 something
greddy fmic

most of the supporting mods to safely daily.. well the car has been dailyed for like 20k miles and zero problems..It was tuned on 10lbs and made like 300ish well I was wondering if I threw a nice meth/alky kit and took it back and got it tuned again would I be able to safely run around 14 psi or even go high if it tunes safely etc? anyone chime in with similar setup thanks

 

10psi will last for 20k miles

14psi might not, I thought the rule of thumb was dont go over 8-11lbs without sleeving?

 

Untrue, my brother in law ran 30lbs on a SOHC Vitara setup with stock sleeves. Ran a 11.3

For the OP why do you want meth inj? I would go with e85 first

 

aww rode in a vitara d series before haha.. junkyard brawlin... So I jus wanna turn the boost up a few pounds maybe get me to like 350 status jus alittle more to play with.. this is jus a daily driver..

 

There really aren't any rules of thumb, each motor is really created and built differently and so goes the same for tuning.
I would honestly invest in some internals for the motor such as pistons and rods because you will always want more power and at least a stout bottom end will support more down the road.

 

It was a Daily Driver

 

Ok.. that will answer my itch for now then.. Ill just leave it alone for now haha... I don't wanna build it I am going to buy a K24 off kmod down in NC or whatever... I had a spare meth kit laying around I was gonna throw it on cuz I know with race gas I can turn the boost up and Meth almost make its race gas octane numbers I thought.. But alright cool deal

 

For starters, your injectors won't make any more power than they already do. If you're at 300whp with 440cc injectors, consider yourself lucky.

Moving on, alcohol/methanol injection works to cool the intake charge so that more power can be made on a certain grade fuel. If the option to upgrade fuels is available (say 92oct to 110oct) then there is no need for alc/meth injection; similarly, your car isn't maxing the fuel its using. On straight 92oct, your setup will be able to make more power, but your engine is a different story...it might not.

If you want to make more power, get a larger set of injectors (720cc), a 3bar MAP sensor and a retune. No need to complicate things with Alc/Meth

That's not really how it works. This whole issue has to do with the heat/pressure generated in the intake charge. Whether that heat is brought in as a byproduct of compressing the air in the turbocharger at high boost OR the heat is due to the large volume of air in the cylinder being compressed, it poses the same problem. A certain fuel, say 92 octane for this example, can only handle so much pressure/heat before it spontaneously combusts without the aid of a spark. This causes big problems inside an engine. Methanol/Alcohol injection uses a phase change (liquid to gas) to absorb the heat out of the intake charge. There is no effect on the octane rating.

 

Thanks... I guess I am gonna just build a K series and have all motor... I was thinking that around 11 psi on my setup was maxed so I could throw the meth inj to come in around 10psi and maybe get around 14 but I understand what your saying my fuel will be burning up due to the heat before the spark comes in possible making detonation...Forged pistons and stronger rods woud come into play what I am trying to stay away from because I am not trying to make this a project car

 

What stage K24 were you intersted in?

-Marquis
-KMOD Performance
Greensboro NC